Shams M., Seyed-Emami K. (2010) Lithostratigraphy and Biostratigraphy of the Dalichai Formation (Middle Jurassic) in Parvar area, North of Semnan, Central Alborz // Geosciences Scientific Quarterly Journal. 19(75). P.89-94. [in Persian with English summary] Pdf: http://www.gs-journal.ir/upload_files/pdf/16289.pdf
The Dalichai Formation and its ammonite fauna is studied for the first time in the Parvar area, Central Alborz. At Parvar the Dalichai Formation, with a thickness of about 70 m, consist of an alternation of grayish silty marls, marlstones, marly limestone and limestone and is subdivided into 5 members. A rich ammonite fauna (407 specimens) have been collected from the member 4 and 5, comprising the following families: Phylloceratidae, Lytoceratidae, Oppeliidae, Haploceratidae, Sphaeroceratidae, Parkinsoniidae, Morphoceratidae and Perisphinctidae. These indicate a Late Bajocian and Bathonian age. Member five consists of greenish to reddish, nodular and flaggy limestones and is a typical condensed horizon.
